I didn't want to, but it's been almost a week since I asked a question... so I'm bumping this.
I'm assuming I need a PD838 in each of the 6800s that don't because the ones that do work have 2x YC902s and 1x PD838 while the ones that don't just have a pair of YC902s.
Is there anything else that might be impeding me from running 7120s in my 6800s? I have the A06 BIOS installed.